MC68HC05K1 FREESCALE [Freescale Semiconductor, Inc], MC68HC05K1 Datasheet - Page 22

• Manufacturer Part Number: MC68HC05K1
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Technical Data
1.6.1 V
1.6.2 OSC1, OSC2, and PB1/OSC3
Technical Data
DD
and V
SS
V
from a single 3.0-V to 6.0-V power supply.
Very fast signal transitions occur on the MCU pins, placing high
short-duration current demands on the power supply. To prevent noise
problems, take special care to provide good power supply bypassing at
the MCU. Place bypass capacitors as close to the MCU as possible, as
Figure 1-3
The OSC1, OSC2, and PB1/OSC3 pins are the control connections for
the 2-pin or 3-pin on-chip oscillator. The oscillator can be driven by any
of these:
The frequency of the internal oscillator is f
internal oscillator output by two to produce the internal clock with a
frequency of f
DD
•
•
•
•
Freescale Semiconductor, Inc.
and V
For More Information On This Product,
Crystal
Ceramic resonator
Resistor-capacitor (RC) combination
External clock signal
Note:
MCU
Actual layout varies according to component dimensions.
SS
Figure 1-3. Bypassing Layout Recommendation
shows.
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are the power supply and ground pins. The MCU operates
op
V
V
General Description
.
DD
SS
C1
+
C2
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
osc
. The MCU divides the
OSC1
OSC2
V
V
DD
SS
C1
C2